springboot+openoffice+jodconverter實現文檔在線預覽

1. 引入依賴

<dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.6</version>
    </dependency>
    <dependency>
        <groupId>org.jodconverter</groupId>
        <artifactId>jodconverter-spring-boot-starter</artifactId>
        <version>4.2.0</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.jodconverter</groupId>
        <artifactId>jodconverter-core</artifactId>
        <version>4.2.0</version>
    </dependency>
    <dependency>
        <groupId>org.jodconverter</groupId>
        <artifactId>jodconverter-local</artifactId>
        <version>4.2.0</version>
    </dependency>

2. application.properties配置

jodconverter.local.enabled=true
jodconverter.local.port-numbers=8100

3. controller代碼

@Controller
public class 	MyController {
    // 第一步：轉換器直接注入
    @Autowired
    private DocumentConverter converter;
    @Autowired
    private HttpServletResponse response;
    @RequestMapping("toPdfFile")
    public String toPdfFile() {
    //該編碼方式只適用於window10本地安裝openoffice，不適用docker鏡像的openoffice，因爲鏡像基於linux系統，你的操作文件/目錄在window，和鏡像不在一臺機器，所以就會報404，url錯誤
		File file = new File("D:/aa.doc");//需要轉換的文件
	try {
	    File newFile = new File("D:/obj-pdf");//轉換之後文件生成的地址
	    if (!newFile.exists()) {
		newFile.mkdirs();
	    }
	    //文件轉化
	    converter.convert(file).to(new File("D:/obj-pdf/hello.pdf")).execute();
	    //使用response,將pdf文件以流的方式發送的前段
	    ServletOutputStream outputStream = response.getOutputStream();
	    InputStream in = new FileInputStream(new File("D:/obj-pdf/hello.pdf"));// 讀取文件
	    // copy文件
	    int i = IOUtils.copy(in, outputStream);
	    System.out.println(i);
	    in.close();
	    outputStream.close();
	} catch (Exception e) {
	    e.printStackTrace();
	}
	return "This is to pdf";
    }
}

4. 下載openoffice
   4.1 window10版openoffice（該方式可用上述的controller代碼測試）
   http://www.openoffice.org/download/
   下載可自定義安裝目錄，也可使用默認的路徑在：
   
   執行如下命令啓動：
   soffice -headless -accept=“socket,host=0.0.0.0,port=8100;urp;” -nofirststartwizard

   4.2 如果基於docker的openoffice鏡像

   version: "3.3"
   services:
   	openoffice:
      		image: "rafaeltuelho/openoffice3-daemon"
      		ports:
      			- 8100:8100
      		command: /opt/openoffice.org3/program/soffice -headless -nofirststartwizard  -accept="socket,host=0.0.0.0,port=8100;urp;"
   

   代碼如下

public void preview(Long fileId, HttpServletResponse response) {
        FileEntity fileData = fileMapper.selectOne(new QueryWrapper<FileEntity>().eq("file_id", fileId));
        String fileName = fileData.getFileName();
        byte[] fileByte=FastDFSClient.getFileByte(fileData);
            //獲得文件名後綴
            String suffix = "";
            if (StringUtils.isNotBlank(fileName) && fileName.contains(".")) {
                suffix = fileName.substring(fileName.lastIndexOf(".") + 1).toUpperCase();
            }

            if (StringUtils.isBlank(suffix)) {
                throw new OutOfBusinessException("文件預覽失敗");
            }

            String[] suffixs = new String[]{"DOC", "DOCX", "XLS", "XLSX", "PPT", "PPTX", "TXT"};


            if (Arrays.asList(suffixs).contains(suffix)) {
                File tempFile = null;
                try {
                    tempFile = File.createTempFile(UUID.randomUUID().toString(), "." + suffix);
                    FileOutputStream fos = new FileOutputStream(tempFile);
                    fos.write(fileByte, 0, fileByte.length);
                    fos.flush();
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }


                String filePath = tempFile.getPath();

                //轉換之後的文件
                File pdfFile = new File(filePath.substring(0, filePath.lastIndexOf(".")) + ".pdf");

                //打開OpenOffice連接
                OpenOfficeConnection connection = new SocketOpenOfficeConnection("127.0.0.1",8100);
                try {
                    connection.connect();
                    DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
                    converter.convert(tempFile, pdfFile);
                    connection.disconnect();

                    filePath = pdfFile.getPath();
                } catch (Exception e) {
                    e.printStackTrace();
                    throw new OutOfBusinessException("文件轉換失敗");
                } finally {
                    try {
                        //發生exception時, connection不會自動切斷, 程序會一直掛着
                        if (connection != null) {
                            connection.disconnect();
                            connection = null;
                        }
                    } catch (Exception e) {
                    }
                }
                response.setContentType("application/pdf");
                //將文件寫入輸出流,顯示在界面上,實現預覽效果
                FileInputStream fis = null;
                try {
                    fis = new FileInputStream(filePath);

                    byte[] byt = new byte[fis.available()];
                    fis.read(byt);
                    writeBytesToOut(response.getOutputStream(), byt, 4096);
                    tempFile.delete();
                    pdfFile.delete();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                //預覽
                response.setContentType(fileData.getFileType());
                try {
                    writeBytesToOut(response.getOutputStream(), fileByte, 4096);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
    }